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U- Structure Design Guidance Sheet <br />I Lower Duranao Boatina Park <br />= do not touch <br />= values that can be adjusted <br />This spreadsheet can be used to help develop average depths of high and low flow channels. Actual dimensions <br />can be set during final design using these numbers as a guideline. Please only adjust cells that are blue. Other <br />cells should not be adjusted at all. Plot values at the bottom can be inserted into HEC -RAS directly using cut <br />and paste. All computations are made using the wier equation and are separated using Shipley's vertical <br />separation method. Dimensions are based on width PROJECTIONS (i.e. the plot shows shadow on the wall of <br />light shown through channels). Arc length is not shown. Analysis is vertical so location of low flow within high <br />flow is not important and will vary according to project constraints. This is not a comprehensive listing of <br />limitations of analysis and spreadsheet should be used by experienced designer for guidance purposes only. <br />Figure 13. Approximate weir calculations for Structure 12 at the lower end of the proposed <br />boating park. <br />Figure 13 shows that at a low flow width of 36 feet the depth in the low flow will be 1.5 feet <br />at 200 cfs. The high flow width of 100 feet creates a center flow depth of 4.2 feet at a flow <br />of 1800 cfs. These dimensions are appropriate for the character of the Animas River at this <br />location. Of note is that this higher flow, of 1800 cfs, is not claimed in the requested flow <br />regime. The claimed peak flow of 900 cfs for Structure 12 provides for this Structure's <br />intended purpose as a novice /intermediate instructional and training feature. At this flow, <br />using the same spreadsheet, the center flow depth is 3 feet. <br />31 <br />